2.3.1. Configuration Sequence
You can initiate reconfiguration by pulling the nCONFIG pin low to at least the minimum t RU_nCONFIG low-pulse width. When this pin is pulled low, the nSTATUS and CONF_DONE pins are pulled low and all I/O pins are either tied to an internal weak pull-up or tri-stated based on the ICB settings.
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